[Branches/1.0] MapBox, fixed white map while dragging with querypoint tool
[Branches/1.0] MapBox, fixed white map while dragging with querypoint tool

git-tfs-id: [https://tfs.codeplex.com/tfs/TFS01]$/SharpMap/Branches/1.0;C107343

nhvu1988/SharpMap,nhvu1988/SharpMap,SharpMap/SharpMap,SharpMap/SharpMap